pain during sex

Brittany
Hello ladies this is my first time posting. I have a question. I recently begin having sex someone and I've noticed that in the middle of the act I  start to dry up. Since I start to "dry up" I have to have him STOP of course because it hurts.. I've had sex with othe people, but I've never had this happen to me with anyone else. Is this normal? I mean I am sexual attracted to him, so I don't know why it could be happening.. I would love some answers as to why it may be happening and some tips for this problem so that when we do have sex again it won't happen. Thanks.